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Title: Relative importance between biogeochemical and biogeophysical effects in regulating terrestrial ecosystem-climate feedback in northern high latitudes

Abstract

Warming-induced changes in structures and functions of northern terrestrial ecosystems (NTEs), including their regulation on terrestrial biogeochemistry and surface energy balance, may exert positive or negative feedback to the climate system. However, the relative importance among these biogeochemical and biogeophysical feedback is not well understood. Here we use a terrestrial ecosystem model to quantify spatially explicit ecosystem-climate feedback over NTEs (north of 50°N) under four climate change scenarios from 2010 to 2100, including biogeochemical feedback from climate-induced changes in net CH4 exchanges (NME) and net CO2 exchanges (NCE) and biogeophysical feedback from changes in surface energy partitioning associated with snow cover and vegetation biomass dynamics. Our results indicate that (1) biogeochemical and biogeophysical feedback are attributed more to the changes in NME and snow cover dynamics, respectively; (2) net biogeophysical feedback is much larger than net biogeochemical feedback; (3) NTEs will cause a net positive radiative forcing of 0.04–0.26 Wm-2 between 2010 and 2100. Our findings support the notion that NTEs will exert positive net climate feedback; however, our estimation of positive net biogeochemical feedback including NME- and NCE-induced effects is contrary to previous studies showing negative net biogeochemical feedback including NCE-induced effect only. In conclusion, this study highlights themore » importance of NME-induced biogeochemical effect in regulating ecosystem-climate feedback in NTEs and implies that previous studies without considering NME-induced effect might have underestimated the intensity of total terrestrial feedback to the climate system.« less

Authors:
 [1];  [2]
  1. Xiamen Univ., Xiamen (China). Key Lab. of the Coastal and Wetland Ecosystems, Ministry of Education; Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab. of Remote Sensing Science, Inst. of Remote Sensing and Digital Earth; Purdue Univ., West Lafayette, IN (United States). Dept. of Earth, Atmospheric, and Planetary Sciences
  2. Purdue Univ., West Lafayette, IN (United States). Dept. of Earth, Atmospheric, and Planetary Sciences; Purdue Univ., West Lafayette, IN (United States). Dept. of Agronomy
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF); National Aeronautic and Space Administration (NASA); Central Universities of China
OSTI Identifier:
1469347
Alternate Identifier(s):
OSTI ID: 1402381
Grant/Contract Number:  
FG02-08ER64599; NNX09AI26G; NSF‐1028291; NSF‐0919331; NSF‐0630319; OFSLRSS201501; 20720160109
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 121; Journal Issue: 10; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ecosystem‐climate feedback; radiative forcing; northern terrestrial ecosystems; terrestrial ecosystem model

Citation Formats

Zhu, Xudong, and Zhuang, Qianlai. Relative importance between biogeochemical and biogeophysical effects in regulating terrestrial ecosystem-climate feedback in northern high latitudes. United States: N. p., 2016. Web. doi:10.1002/2016JD024814.
Zhu, Xudong, & Zhuang, Qianlai. Relative importance between biogeochemical and biogeophysical effects in regulating terrestrial ecosystem-climate feedback in northern high latitudes. United States. doi:10.1002/2016JD024814.
Zhu, Xudong, and Zhuang, Qianlai. Fri . "Relative importance between biogeochemical and biogeophysical effects in regulating terrestrial ecosystem-climate feedback in northern high latitudes". United States. doi:10.1002/2016JD024814. https://www.osti.gov/servlets/purl/1469347.
@article{osti_1469347,
title = {Relative importance between biogeochemical and biogeophysical effects in regulating terrestrial ecosystem-climate feedback in northern high latitudes},
author = {Zhu, Xudong and Zhuang, Qianlai},
abstractNote = {Warming-induced changes in structures and functions of northern terrestrial ecosystems (NTEs), including their regulation on terrestrial biogeochemistry and surface energy balance, may exert positive or negative feedback to the climate system. However, the relative importance among these biogeochemical and biogeophysical feedback is not well understood. Here we use a terrestrial ecosystem model to quantify spatially explicit ecosystem-climate feedback over NTEs (north of 50°N) under four climate change scenarios from 2010 to 2100, including biogeochemical feedback from climate-induced changes in net CH4 exchanges (NME) and net CO2 exchanges (NCE) and biogeophysical feedback from changes in surface energy partitioning associated with snow cover and vegetation biomass dynamics. Our results indicate that (1) biogeochemical and biogeophysical feedback are attributed more to the changes in NME and snow cover dynamics, respectively; (2) net biogeophysical feedback is much larger than net biogeochemical feedback; (3) NTEs will cause a net positive radiative forcing of 0.04–0.26 Wm-2 between 2010 and 2100. Our findings support the notion that NTEs will exert positive net climate feedback; however, our estimation of positive net biogeochemical feedback including NME- and NCE-induced effects is contrary to previous studies showing negative net biogeochemical feedback including NCE-induced effect only. In conclusion, this study highlights the importance of NME-induced biogeochemical effect in regulating ecosystem-climate feedback in NTEs and implies that previous studies without considering NME-induced effect might have underestimated the intensity of total terrestrial feedback to the climate system.},
doi = {10.1002/2016JD024814},
journal = {Journal of Geophysical Research: Atmospheres},
number = 10,
volume = 121,
place = {United States},
year = {2016},
month = {5}
}

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